Multifunction and safe electric pressure cooker

ABSTRACT

This type of product declare a multifunction safe electric pressure cooker comprises lid, outer body, warm-keeping Container, control panel, inner tank, sealant washer, heating plate under the inner tank, control device. The control device comprises the control circuit, pressure switch, temperature control device. The pressure switch and the temperature control device are under the warm-keeping Container. On the lid there are floating valve, pressure discharging valve, safety valve. Between the heating plate and the warm-keeping Container there is a spring device. Under the said heating plate there is a pole. The characteristic of it is that the control device comprises a sensor under the heating plate to sense whether has an inner tank in. Between the lid and the body sets a lid safety control switch that connected to the control circuit. Using the said structure of the electric pressure cooker, it can be more convenience, durable, and can fry and saute food, and has multi-protect devices such as open-and-close-lid-safety-control.

FIELD OF THE INVENTION

The practical and newly developed type of cooker relates to in atechnical area of an electric pressure cooker.

BACKGROUND OF THE INVENTION

Because of the convenience and energy saving, the electric pressurecookers are more and more accepted. The electric pressure cooker belongsto the pressure container, so the safety is an important problem tosolve.

Present electric pressure cooker always just has one function, and oneunvarying warming temperature that can't be adjusted to prevent fromunsafe complications such as cook without water. When using, it has itslimitation. If it can't adjust the pressure and temperature, the powercan't be adjusted too, and this type of the construction makes thepressure cooker energy consuming, single functioning, inapplicable,limited, and not safe enough.

For multifunction electric pressure cooker, its control device oftenseries-parallel connected by fuse, timer, thermostat and heating plate.The fuse, thermostat and heating plate are in series in the electricloop circuit, while the heating light and the keep warm light are on thepanel of the control device. The shortage of foregoing control device isthat when one of the protect device—the thermostat and the pressureswitch broken, the whole device is of no use. When the pressuredischarging valve is placed wrong or any other factor causes the lick ofthe gas, or the steam in the cooker is not enough to make the pressureswitch move, the cooker will be in high temperature because of therepeat heating, and the food in the cooker will be adjust, even causeaccident.

At the same time, the present electric pressure cooker commonly lock thebody and the lid by flange by the edge of the lid, while groove by theupper edge of the body, and then circumgyrate the lid to lock. Thissetup is simple but inconvenient. Another type of the pressure cooker isthe cooker with lid tightly locked setup. The setup composed with a lockhoop in the groove of the lid, a manual control device and atransmission from a manual control device to the lock hoop. The lockhoop has a space for it to expend. The lock hoop has a flat plane, whichhas an angle with the body of the cooker. The transmission device is inthe handle, which composed with a trigger-connected locomotors deviceand connected with the lock hoop. And it can make the lock hoop expendthrough the gear. The foregoing setup has some improvement, but stillhas space to improve. The slippage cause by opening and closing the lidwill do some wear and tear to the conjunct plane, and it's hard to use.So it's still not safe enough.

SUMMARY OF THE INVENTION

The goal of this product is to solve the problem of the lack of thetechnology. It provides with a kind of electric pressure cooker that isconvenient and durable. It can fry and saute food, and has amulti-protect devices such as open-and-close-lid-safety-control.

For the foregoing goal, our new product solves the problem as below:

This multifunction safe electric pressure cooker is made up of the lid,the outer body, warm-keeping Container, the control panel, the pressurecooker inner pot, seal, the heating plane setting under the bottom ofthe inner pot, the control device that composed with a circuit, apressure switch, a thermostat. The temperature control device and thepressure switch are under the warm-keeping Container, and floatingvalve, pressure discharging valve, security valve are settled in thelid. Between the heating plane and the warm-keeping Container there is aspring device. The control device also comprises a response device underthe heating plate to check inner pot whether be set; set a securityswitch between the lid and the body to check the lid whether be lockedexactly. All the switches are connected with the control circuit.

The foregoing spring device is a U shaped spring that can be arrangeduniformity in two or more. In this way, they can make a spring device.The upside of the U shaped spring is connected to the heating platewhile the beneath side is on the warm keeping case while the bottom isrunning through the hole at the bottom of the warm-keeping Container.One end of the pressure switch is under the pole, the other end is rivetto the warm-keeping Container.

Between the lid and the body there is a lock device that including lidbuckles at the edge of the lid, which can be connected to the body(comprises middle ring or inner pot), and a transmission device thatconnected to the lid buckles and makes it swing. The foregoing lidbuckles is one or more. It's riveted to the lid by the hinge axis. Thistransmission device is made up by a ring shaped slider riveted to thelid. One of the ends of the ring shaped slider's edge has a runner. Theamounts of the runner are the same with the lid buckle. One end of thelid buckle insert to the runner. The transmission device is alsoconnected to a drive device that makes it slip in hoop. The buckle inthe runner is following the ring shaped slider to circumgyrate andswing, so the lid can be locked.

To explain clearer, the said drive device is a pole that in the lid andconnected to the ring shaped slider.

The said drive device is made up of the motor and the pole connected tothe motor. One end of the pole connected to the slider. There is a wheelconnected to the motor, and the pole is in the deflective center of thewheel.

The said lid buckle is at the edge of the lid.

The upper surface of the said ring shaped slider has a runner. Betweenthe runner and the lid there is a stop bolt that can restrict themovement of the slider.

The said control circuit is made up of microprocessor. A temperaturesense device in the centre of heating plate, cook without the inner tankprotect switch, open & close lid switch, pressure control switch,pushbutton switch. The output part comprises the heating plate, theindicator device such as LED lights, LCD.

One side of the said temperature controller is connected to the couplingof the thermostat and the pressure control switch, while the other sideis connected to the timing switch. This makes the temperature controllerin series with the thermostat or the pressure control switch, and thenparallel connects to the timing switch. The said temperature can be inseries with the timing switch directly.

The salutary effect of the present invention is below:

1. You can move the ring shaped slider by yourself, or let thecircumgyrating handle or the electrical device drive it. Thecircumgyrating movement of the transmission device brings the slider todo the up-and-down movement, and then drives the lid buckle to swing. Itcan avoid abrasion of the lid and the middle ring or the inner tank, andlast the longevity. The use of it can be convenient and energy saving.

2. It has many buckles to lock the body, so it's very safe.

3. It's easy to repair. If the lid buckles broken, you only have tochange it. It can save more cost comparing to the older ones.

4. The electric pressure cooker uses the mechanical device. If any ofthe thermostats, temperature controllers or pressure control switches inthe circuit is broken, others will still be fine. When there are twodevices broken, the other one can be fine too. So it can be safe, andwon't cause accidents.

5. The electric pressure cooker use microprocessor control. Themicroprocessor control circuit can adjust the warm-keeping time and thetemperature, but the warm-keeping temperature of the present electricpressure cooker is fixed, immutable. The average heating power can beadjusted by the microprocessor control, but the present electricpressure cooker's heating plate power is fixed, immutable, so it willlead to the waste of energy. The microprocessor control can adjust thepressure in the inner tank, but the present electric pressure cooker'spressure is fixed, immutable, also waste of energy.

6. This product add some safety control device, such as temperaturecontrol, pressure control, whether has an inner tank control, open &close lid control, to ensure the safety and the convenience.

7. This product has a signal light or switch for whether has an innertank in the cooker, so it prevents the heating plate working without theinner tank, so it's safer.

8. This product has a pressure signal light or switch. It can controlthe temperature and the pressure, more safe. At the same time, thepressure can be adjusted by the pressure control bolt.

9. This product can saute and fry by control the temperature, so itincreases the function and the bound.

10. The inner tank is ellipse; enlarge the space, so it will be easierto put the food.

11. This product uses many safety device, such as safety valve, floatingvalve, spring device, pressure discharging valve and so on, to airproofthe inner tank by the dynamic airproof. When the heating makes thepressure up to the working pressure, the steam in the tank will prop upthe pressure switch, and turn off the power to control the pressure;when the pressure up to a confine, the sealant washer will leave theinner tank to discharge the pressure. So it's very safe.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is one of the practical and newly developed type of electricpressure cooker's structure. (Microprocessor type)

FIG. 2 is the lid joint part structure of the one in FIG. 1.

FIG. 3 is the side part structure of the one in FIG. 1.

FIG. 4 is the planform of the one in FIG. 1.

FIG. 5 is the inner structure of the lid of the one in FIG. 1.

FIG. 6 is circuit diagram of the one in FIG. 1.

FIG. 7 is the security structure at the bottom of the tank.

FIG. 8 and FIG. 9 are the mechanical switch part cutaway views.

FIG. 10 is the mechanical switch part circuit diagram.

FIG. 11 is the lid structure of one of the practical and newly developedtype of electric pressure cooker.

FIG. 12 is planform of the one in the FIG. 11.

FIG. 13 is the lid structure of one of the practical and newly developedtype of electric pressure cooker.

FIG. 14 is planform of the one in the FIG. 13.

FIG. 15 is example structure of the lid.

FIG. 16 is the inner part planform of the practical and newly developedtype of electric pressure cooker.

FIG. 17 and FIG. 19 are the structure of the lid when lock or unlock.

FIG. 20 is the structure of the edge of the slider in the practical andnewly developed type of electric pressure cooker.

Direction of the remark:

1. Lid; 2. Outer body; 3. Heating plate; 4. Spring device; 5.Warm-keeping Container; 6. Pole; 7. Pressure switch; 8. Inner tank; 9.Middle ring; 10. Sealant washer; 11. Slider; 12. Pull-rod; 13. Lidbuckle; 14. Microprocessor control panel; 15. Microprocessor controlPCB; 16. Power supply PCB; 17. Floating valve; 18-1. Safety valve; 19.magnetic switch; 20. Heat insulating device; 21. Metal diathermanoussubstance; 22. Temperature sensor; 23. Insulator; 24. Down-leads of thetemperature sensor; 25. Contact of the adiabatic ring; 26. Down-leads ofthe temperature sensor; 27. Control circuit; 28. Metal touch point underthe insulator; 29. Contact on the insulator; 30. Contact on theadiabatic device; 31. Thermostat; 32. Temperature controller; 33.Multifunctional switch box; 34. Multifunctional light panel; 35. Timer;36. Slider restricting bolts; 37. Handle fixing bolt; 38. Revolvinghandle; 39. Lid cover; 40. Poker; 41. Pressure board bolt; 42. Pressureboard; 43. Bracket ream axes; 44. Lid buckle bracket; 45. Runner on thelandscape orientation; 46. Motor; 47. Runner on the edge.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

From FIGS. 1 to 5 is an example of the Multifunction and safe electricpressure cooker which has a Microprocessor controller. It comprises lid1 which is made of floating valve 17, pressure discharging valve 18,safety valve 18-1, lid handle, lid cover 39, sealant washer 10 and innertank 8, middle ring 9 warm-keeping Container 5, outer body 2, watercollector, heating plate 3, pedestal tank body which comprisesMicroprocessor controller and control device and so on. Because floatingvalve is under the slider, it can lock the lid just when the lid islocked and the floating valve float and pressure make in the inner tank.Because of the gravity, the pressure-discharging valve will block up thevent-pipe. Normally, in the range of the working pressure controlled bythe pressure switch, the vent-pipe will not exhaust. But when thepressure switch is out of order and the pressure rise to a certaindegree, the pressure will push the pressure-discharging valve to let thesteam out through the vent-pipe to ensure the safety. There is a controlpanel 14 on the outer body 2. On the panel there is a PCB 15 thatcomprises indicator lights, microprocessor and key-press. The Powersupply PCB 16 is in the pedestal. Between lid 1 and the body there is alid buckle 13. On the lid there is a slider 11, poker 12. Control deviceis made of the thermostat device, pressure switch 7 and the controlswitch. The pressure switch 7 is under the pole 6 under the heatingplate 3. The floating valve 17 and the pressure discharging valve is onthe top of the lid 1. Between the heating plate 3 and warm-keepingContainer 5 there is a spring device 4, which made up of U shaped spring4. It is equally arranged together with two or more. The upper side ofthe U shaped spring 4 is connected with the heating plate 3, while thebeneath side is on the warm keeping case 5.

FIG. 6 is a circuit diagram of the multifunction and safe electricpressure cooker with the microprocessor controller. Its control circuitis made of single chip. In the heating plate 3, there is a temperaturesensor device 22 that has a thermal resistance in it. Between the lid 1and the body there is an open & close lid safety control switch 19. Thesingle chip control circuit is made of the input and output part of thesingle chips. The input part is made of the temperature control signal,sensor switch sense whether has an inner tank in, open & close lidsafety control switch 19, pressure input control switch and key-press.The output part is made of heating plate control circuit, display,signal light control circuit, sound hint control circuit.

As FIG. 7 shows, the temperature control device and the detect deviceare between the heating plate 3 and the warm-keeping Container(adiabatic plate) 5, including the temperature sensor device 22 in thehole of the heating plate 3. The two signal down-lead 24, 26 and thecontroller's control circuit 27 make of the temperature control signalswitch. Between the surface of the temperature sensor 22 and the heatingplate 3, there is an adiabatic device 20, which is an adiabatic ring andis made from bakelite. There is a metal diathermanous body 21 at the topof the temperature sensor 22, while there is an insulator 23 under it.The insulator can be bakelite and make of cap shaped buckle on thetemperature sensor with the metal diathermanous body. On the top andbottom of the surface of the insulator 23 it has protruding metalcontact 28, 29, which can be a metal pole together. The adiabatic device4 above the insulator 23 has the same metal contact 30. The two metalcontact 29, 13 and the controller control circuit 27 make of the signalor the switch whether has an inner tank in. The metal contact 28 at thebottom of it also has a same contact 25. The said contact 25 can be anadjusted bolt fixed to the bottom of the safety control device to adjustthe sensed pressure in the tank.

During the process, if the inner tank 8 wasn't in, the cooker will stopheating. When the pressure reach to a certain degree, the metal contact28, 25 will be connected and give out the pressure signal. Thecontroller can adjust the heating according to this signal. The twodown-leads of the temperature sensor 22 are connected to the single chipcontrol circuit, so the controller can adjust the heating according toits temperature signal.

As the FIGS. 2, 3 shows, the open lid safety device of this productcomprises lid 1, body. There is a lid control switch between the lid andthe body. This control switch is connected to the connection of theelectrical source and the heating plate 3, and also connected to thecontrol circuit. The control switch has the signal of the state whetherlid is opened or closed, and then it sends the signal to the single chipof the control circuit. The microprocessor controls the relay to switchon or off the heating plate. So the single chip controls the electricpressure cooker. The single chip can send out the warning signal throughthe change signal of the control switch's state. The lid control switchis made of the lid 1 and the Reed Switch 19. As FIG. 5 shows, the upperplane of the handle on the body is under one side of the handle of thelid 1, while a magnet is under one side of the lid handle and the ReedSwitch is on the upper plane of the handle on the body. When the lidcloses, it inset into the groove of the body's edge. When the lidcompletes closed, the reed switch close, and the controller can startheating.

The said lid control switch can be a touch switch or photovoltaic switchsetting between the lid and the body as one of the example of thisproduct.

As the FIGS. 8, 9, 10 shows, the difference between this example and theexample in FIG. 1 is that the control switch is mechanical structured,there is a mechanical panel 33, in which there is a light board 34, atimer 35. There is a thermostat 31, temperature controller 32. Thecontrol circuit is made of a ultrahigh temperature protector RD, a timerM, a timer switch K, heating thread in the heating plate R in series.The temperature control device comprises thermostat T2 and temperaturecontroller T1. The thermostat T2 (31) and pressure adjusted switch KT,timer M (35) make up of the circuit. One side of the temperaturecontroller is connected to the connection of the thermostat T2 and thepressure adjusted switch, while the other side is connected to the timerswitch. There is a heating light XD1 in series with resistance R1, whichparallel connects to both side of the timer M. There is a warm-keepinglight XD in series with resistance R2, which parallel connects to bothside of the timer switch K. There is a heating light XD2 in series withresistance R3, which parallel connects to both side of the heatingthread of the heating plate.

The pressure adjusted switch KT and the thermostat T2 can be changed inposition in FIG. 10, and others are the same with FIG. 1. At the sametime, the temperature controller T1 can be parallel connected to thetimer switch K directly.

As FIGS. 11, 12 shows, there is a lock device between the lid and thebody. It's including the lid buckle 13 on the edge of the lid 1 that canbe fasten to the middle ring of the body, the transmission device thatcan swing the lid buckle 13. The said lid buckle 13 is one or more, andin this example there are four. The lid buckles 13 are equally arrangedon the edge of the lid 1. The lid buckles 13 fixed to the lid by the lidbuckles bracket 44. They have the bracket axes 43 between them, andthere is the pressure board 42 on bracket 44. The pressure board 42fixed to bracket 44 by the pressure board bolt 41. This transmissiondevice is made of the ring shaped slider 11 that fix to the lid 1actively. As FIG. 19 shows, there are runners 47 with the same amount ofthe buckles on the edge of slider. One end of the lid buckle inset intothe runner 47. There are landscape-orientated runners 45 on the upperside of the said slider 11. Between the landscape-orientated runner 45and the lid 1, there are slider restrict bolts 36. The transmissiondevice also connected to the driving device that can drive it slip. Thisdriving device is made up of the revolving handle 38, the poker 40connected to the bottom of the revolving handle 38. One end of the poker40 connected actively to the slider 11. There is a hole in slider 11,and the end of the poker 40 insert into the hole to move the slider. Therevolving handle 38 is fixed to the middle of the lid 1 by thehandle-fixing bolt 37. The poking 40, slider 11 are in the cover of thelid 39.

When using it, turn the revolving handles 38 to make the poker 40 movethe slider to roll. The side runner 47 of the slider 11 is a runner thatnot in the same plane. As FIG. 20 shows, the lid buckles is made toswing to lock or open. As FIGS. 18, 19 shows.

As FIGS. 13, 14 shows, the main difference between this example and theexample in FIGS. 11, 12 is that the said driving device is made of thepoker with a handle, and it's connected directly to the ring shapedslider 11.

As FIGS. 15, 16 shows, the main difference between this example and theexample in FIGS. 11, 12 is that the said driving device is made of themotor and the poker 40 connected to it. The poker's end is connectedactively to the slider. On the axes of the motor there connected awheel. The poker 4 is on the eccentricity of the axes.

When this product is working, it can control the lock intelligently bythe control motor.

In FIGS. 17, 18, it will work in two ways: turn the handle by hand ormotor. The difference between the motor 46 controls and FIG. 13 is thatin motor 46 controls, the motor is portrait setting. The poker 40 is agear-driven poker. The motor's gear drives the poker 40 move to lock thelid.

The pressure control and the protection working elements of this productare as below:

When the pressure cooker is electrified and starts heating, the innertank is heated and the hot air discharges through the floating valve.

When the heating reach to a certain degree, the steam formed in theinner tank and discharges through the floating valve.

When keeping on heating, the pressure formed by the steam is strongenough to prop up the floating valve, and the inner tank turns to anairproof environment.

When the heating time is enough to make the pressure in the inner tankact on the bottom of the tank, the heating plate and the spring device,and make the inner tank and the heating plate both move down.

When the pressure goes beyond the limit pressure, the movement of theheating plate will lead to the cut off the heating. The turn off signalwill be send to the control circuit to stop heating.

When stop heating, the pressure in the inner tank will go down, and thespring device will make the heating plate and the inner tank return totheir original position, and the pressure switch will turn on again. Thesignal will be sent to the control circuit to reheat. This process willrecurrent to make the pressure in a certain scope. When it's the time,it will over.

1. A multifunction safe electric pressure cooker comprising a lid, anouter body, a warm-keeping Container, a control panel, an inner tank, asealant washer, a heating plate under said inner tank, and a controldevice; wherein said control device comprising a control circuit, apressure switch, a temperature control device, and a sensor under saidheating plate to sense whether has an inner tank in; said pressureswitch and said temperature control device are under said warm-keepingContainer; on said lid, there are a floating valve, a pressuredischarging valve, and a safety valve; between said heating plate andsaid warm-keeping Container, there is a spring device; under saidheating plate, there is a pole; an end of said pole is fixed to saidheating plate, and other end is drill through a hole at the bottom ofsaid warm-keeping Container; an end of said pressure switch is undersaid pole, and other end is fixed to said warm-keeping Container;between said lid and said body, there is a lid safety control switchthat connected to said control circuit.
 2. The multifunction safeelectric pressure cooker of claim 1, wherein said spring device isequally arranged together with two or more devices; an upper side of a Ushaped spring is connected with said heating plate, while a beneath sideis on said warm-keeping Container.
 3. The multifunction safe electricpressure cooker of claim 1, wherein between said lid and said body thereis a lock device, which comprising a lid buckle on the edge of said lid,and a transmission device connected to a buckle and make it swing. 4.The multifunction safe electric pressure cooker of claim 3, wherein saidlid buckle is fixed to said lid by a ream axes; said transmission deviceis made of a ring shaped slider fixed on said lid; a runner on the edgeof said slider is not in the same plane, and has the same amount withbuckles; one end of said buckle inserts into said runner; saidtransmission device connects to a driving device that can make it slip.5. The multifunction safe electric pressure cooker of claim 1, whereinshape of said lid, said body and said inner tank is elliptic.
 6. Themultifunction safe electric pressure cooker of claim 4, wherein saiddriving device is a ring shaped slider connected directly to a pokerwith a handle.
 7. The multifunction safe electric pressure cooker ofclaim 4, wherein said driving device is made of a revolving handle and apoker under a revolving handle; an end of said poker connects to aslider actively.
 8. The multifunction safe electric pressure cooker ofclaim 4, wherein said driving device is made of a synchronous motor anda poker connected to said synchronous motor; an end of said pokerconnects to said slider actively.
 9. The multifunction safe electricpressure cooker of claim 8, wherein axes of said synchronous motor isconnected to a wheel, and said poker is in an eccentricity of said axes.10. The multifunction safe electric pressure cooker of claim 4, whereinsaid driving device is made of a revolving handle on said lid, asynchronous motor on said lid, and a poker as a connection of the bottomof said revolving handle and a synchronous motor; an end of said pokerconnects to said slider actively.
 11. The multifunction safe electricpressure cooker of claim 3, wherein said lid buckle is one or more; saidlid buckles are equally arranged on the edge of said lid.
 12. Themultifunction safe electric pressure cooker of claim 3, wherein there isa runner on said ring shaped slider, and between said runner and saidlid there is a restrict bolt.
 13. The multifunction safe electricpressure cooker of claim 1, wherein said temperature control devicecomprising a temperature sensor in a hole of said heating plate, twosignal down-lead, and a temperature control signal switch made of acontroller's control circuit; between the surface of said temperaturesensor and said heating plate, there is an adiabatic device; there is ametal diathermanous body at the top of said temperature sensor, whilethere is an insulator under it; on the top and bottom of the surface ofsaid insulator, there is a protruding metal contact; said adiabaticdevice above said insulator has the same metal contact; a signal or aswitch is made of said two metal contacts and said controller controlcircuit whether has an inner tank in; said metal contact at the bottomof it also has a same contact; a pressure signal or a pressure switch ismade of said two metal contacts and said control circuit.
 14. Themultifunction safe electric pressure cooker of claim 13, wherein saidswitch is made of a reed switch between said lid and said body.
 15. Themultifunction safe electric pressure cooker of claim 13, wherein saidswitch is made of a touching switch between said lid and said body. 16.The multifunction safe electric pressure cooker of claim 13, whereinsaid switch is made of a photovoltaic switch between said lid and saidbody.
 17. The multifunction safe electric pressure cooker of claim 1,wherein an end of said temperature control device is connected to saidpressure switch, while the other end is connected to a timer switch;said temperature control device is in series with one of a thermostatand said pressure switch, and parallel connects with said timer switch.18. The multifunction safe electric pressure cooker of claim 17, whereinsaid switch is mechanical structured; said control circuit is made of anultrahigh temperature protector, a timer, a timer switch, heating threadin said heating plate in series; a circuit is made up of saidthermostat, pressure switch and timer; said timer switch also connectsto said temperature control device.
 19. The multifunction safe electricpressure cooker of claim 17, wherein said temperature control device isparallel connected to said timer switch directly.